CN111301604A - Underwater cavitation load reduction rod structure for underwater vehicle throwing - Google Patents
Underwater cavitation load reduction rod structure for underwater vehicle throwing Download PDFInfo
- Publication number
- CN111301604A CN111301604A CN202010265651.9A CN202010265651A CN111301604A CN 111301604 A CN111301604 A CN 111301604A CN 202010265651 A CN202010265651 A CN 202010265651A CN 111301604 A CN111301604 A CN 111301604A
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- aircraft
- load
- rod
- cavitation
- positioning piece
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
- B63B1/32—Other means for varying the inherent hydrodynamic characteristics of hulls
- B63B1/34—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction
- B63B1/38—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction using air bubbles or air layers gas filled volumes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
- B63B1/32—Other means for varying the inherent hydrodynamic characteristics of hulls
- B63B1/34—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction
- B63B1/38—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction using air bubbles or air layers gas filled volumes
- B63B2001/382—Other means for varying the inherent hydrodynamic characteristics of hulls by reducing surface friction using air bubbles or air layers gas filled volumes by making use of supercavitation, e.g. for underwater vehicles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T70/00—Maritime or waterways transport
- Y02T70/10—Measures concerning design or construction of watercraft hulls
Abstract
The invention relates to a load reducing rod structure for underwater vehicle launching cavitation, which comprises a load reducing rod, a positioning piece and a connecting piece. The load reduction rod is composed of a cylindrical section and a circular truncated cone section, plays a role of cavitation when the aircraft enters water, effectively reduces the water-entering wetting area of the aircraft, can control the size of generated cavitation by adjusting the length of the rod body and the length of the cone, completely wraps the aircraft, and is designed for different water-entering working conditions and aircraft with different sizes. The positioning piece is a disc, the load reduction rod body is welded on the front end face of the positioning piece disc, and the rear end face of the positioning piece disc is attached to the head of the aircraft and serves as a supporting face. The connecting piece is an explosion bolt, the positioning piece is combined with the aircraft, and after the aircraft enters water, the bolt is detonated at a proper time, so that the load descending rod is separated from the aircraft, and the hydrodynamic performance and the underwater trajectory of the aircraft are not influenced.
Description
Technical Field
The invention belongs to the field of underwater vehicle entry load shedding devices, relates to an underwater vehicle thrown underwater cavitation load shedding rod structure, and particularly relates to a method for realizing safe and reliable underwater vehicle entry by adding a cavitation load shedding rod to the head of a vehicle.
Background
The underwater vehicle can be launched in the air by means of air drop, rocket assisted flight and the like, and can also be launched by a surface ship or an underwater submarine and the like, wherein the underwater vehicle can quickly arrive at an operation sea area to carry out work by air drop, and energy and search time are saved.
The air launched underwater vehicle faces the problem of water ingress, and the vehicle is subjected to huge impact loads during the water ingress process, which can cause the vehicle shell to be broken and the internal structure of the vehicle to be damaged, and can affect the water ingress trajectory of the vehicle to cause the vehicle to fail in the water ingress. It is therefore desirable to reduce the impact loads to which aircraft are subjected, which is the subject matter of this document. In 2000, the U.S. naval performed ballistic tests on the arabian test pool, and the tests showed that when a supercavity projectile was launched at 5040km/h, it could reach 3600km/h at 25m underwater, and was equipped with the military in 2007.
The cavitation load shedding rod is designed by considering the load shedding performance of the aircraft in the water entering process and the overall structural requirement of the aircraft, so that the cavitation load shedding rod is generally designed to meet the following main performance requirements:
1, the aircraft can generate cavitation when entering water at the lowest underwater entering speed;
2, the water entering condition of the aircraft can be improved, and great flutter is avoided, so that the stability of a water trajectory at the initial water entering stage is facilitated;
3, after entering water, the cavitation load reduction rod can be separated from the aircraft, so that the performance of the aircraft in subsequent underwater motion is not influenced;
4, the size is convenient and can be accommodated by the overall design;
an anti-mine system known as RAMICS in the united states utilizes the principle of the supercavity technique, carried by a helicopter, with a cannon generating system carried by the helicopter, to load a truncated cone shaped cavitator onto a supercavity projectile (MK258) for producing a supercavity effect when entering water at high speed.
Disclosure of Invention
Technical problem to be solved
In order to avoid the defects of the prior art, the invention provides a load reducing rod structure for underwater vehicle launching cavitation, and when the vehicle enters water, the load reducing rod can generate a supercavitation effect, so that the impact load acting on the vehicle is reduced. The cavitation load-reducing rod structure is simple in structure, reliable in connection and capable of effectively reducing underwater impact load of the aircraft.
Technical scheme
A underwater vehicle launched underwater cavitation load shedding rod structure is characterized by comprising a load shedding rod 1, a positioning piece 2 and a connecting piece 3; the positioning piece 2 is of a disc structure and is connected with the head of the aircraft 4 through a plurality of connecting pieces 3, and the load reduction rod 1 is coaxially and fixedly connected with the positioning piece 2 and the aircraft 4; the load reducing rod 1 is in a truncated cone shape; the connecting piece 3 adopts an explosion bolt, after the aircraft 4 enters water, the explosive of the explosion bolt is detonated, the shear lock is sheared or is broken along the bolt weakening groove, and the load reducing rod is separated from the aircraft.
The diameter and length of the load shedding bar 1 are such that the length of the generated cavitation bubbles is 1.2 times the length of the vehicle 4, and the maximum diameter of the cavitation bubbles is 1.5 times the diameter of the vehicle 4.
The length of the cylindrical section of the load descending rod is 350mm, the diameter of the load descending rod is 100mm, the length of the truncated cone is 50mm, the thickness of the connecting body disc is 10mm, and the diameter of the flat-head aircraft is 533mm, which is the same as the diameter of the head of the aircraft 4.
The disc diameter of the positioning element 2 corresponds to the diameter of the head of the vehicle 4.
The load reducing rod 1 is made of high-strength alloy steel.
Advantageous effects
The invention provides a load reducing rod structure for underwater vehicle launching cavitation, which comprises a load reducing rod, a positioning piece and a connecting piece. The load reduction rod is composed of a cylindrical section and a circular truncated cone section, plays a role of cavitation when the aircraft enters water, effectively reduces the water-entering wetting area of the aircraft, can control the size of generated cavitation by adjusting the length of the rod body and the length of the cone, completely wraps the aircraft, and is designed for different water-entering working conditions and aircraft with different sizes. The positioning piece is a disc, the load reduction rod body is welded on the front end face of the positioning piece disc, and the rear end face of the positioning piece disc is attached to the head of the aircraft and serves as a supporting face. The connecting piece is an explosion bolt, the positioning piece is combined with the aircraft, and after the aircraft enters water, the bolt is detonated at a proper time, so that the load descending rod is separated from the aircraft, and the hydrodynamic performance and the underwater trajectory of the aircraft are not influenced.
Drawings
FIG. 1 shows the principle of natural supercavitation, 5-cavitator, A-cavitation boundary, 4-vehicle, U0As aircraft speed, P0Ambient water pressure, P, around the aircraftcFor internal pressure of cavitation
FIG. 2 is a view of the structure of the load-dropping rod
Description of reference numerals: 1-rod body, 2-positioning piece, 3-connecting piece and 4-aircraft
Detailed Description
The invention will now be further described with reference to the following examples and drawings:
when the aircraft enters water at a certain speed, the ambient water pressure P around the aircraft is under the action of the head cavitator0There is a pressure drop process when the pressure is dropped to the cavitation internal pressure PcWhen Δ p is equal to p0-pcAnd the cavitation bubbles form a cluster, once the dynamic process reaches an equilibrium point again, namely the pressure values of the two are equal, at the moment, r ═ r (x) r is the radius of the cavitation bubbles, x is the radial length of the cavitation bubbles, the condition of the continuity boundary of the cavitation bubbles is met, and when the boundary is in a constant stable state, a stable and smooth natural supercavity (the head-removing cavitator is in a wet state) which wraps the whole projectile is formed.
The load-reducing rod device is provided in the section to realize safe water entry, and the basic principle of the load-reducing rod device is that the load-reducing rod plays a role in cavitation bubble formation when the aircraft enters water, the flow field structure is changed, the water entry wetting area of the aircraft is effectively reduced, and therefore the water entry impact load acting on the aircraft is reduced.
The bottom end of the load shedding rod body 1 is in a truncated cone shape, the load shedding rod body is made of high-strength alloy steel, and the length and the diameter of the load shedding rod body are selected according to the limit impact load borne by the aircraft 4 and the water inlet speed of the aircraft, so that the generated cavitation bubbles are closed at the tail part of the aircraft;
the positioning piece 2 is a homogeneous revolving body disc, the load descending rod body is welded at the center of the positioning piece, and the rear end face of the positioning piece is tightly attached to the head of the aircraft to form a supporting surface for the interaction of the aircraft and the load descending rod. The length of the cylindrical section of the load descending rod is 350mm, the diameter of the load descending rod is 100mm, the length of the truncated cone is 50mm, the thickness of the connecting body disc is 10mm, the diameter of the connecting body disc is the same as the diameter of the head of the aircraft 4, and the size is designed for a flat-head aircraft with the diameter of 533 mm. The specific dimensions of each component are determined from the aircraft 4;
the connecting piece 3 adopts explosion bolts to firmly connect the positioning piece to the end surface of the head of the aircraft 4, and the four bolts are uniformly distributed around the positioning piece disc 2.
After the load reducing rod is installed, the aircraft generates natural cavitation when entering water, and the periphery of the aircraft generates ellipsoid of revolution cavitation. And secondly, selecting the proper diameter and length of the load reducing rod 1, so that the length of the generated cavitation bubbles is approximately 1.2 times of the length of the aircraft 4, the maximum diameter of the cavitation bubbles is approximately 1.5 times of the diameter of the aircraft 4, and at the moment, the cavitation bubbles completely wrap the aircraft, so that most of the surface of the aircraft is contacted with water vapor, the wetted area of the aircraft is reduced, and the impact load is reduced.
After the aircraft 4 enters water, explosives of the explosive bolts are detonated, the shear locks are sheared or broken along the bolt weakening grooves, the load reducing rods are separated from the aircraft, and the aircraft enters an underwater navigation stage.
Claims (5)
1. A underwater vehicle launched-in water cavitation load reduction rod structure is characterized by comprising a load reduction rod (1), a positioning piece (2) and a connecting piece (3); the positioning piece (2) is of a disc structure and is connected with the head of the aircraft (4) through a plurality of connecting pieces (3), and the load reducing rod (1) is coaxially and fixedly connected with the positioning piece (2) and the aircraft (4); the load reducing rod (1) is in a truncated cone shape; the connecting piece (3) adopts explosion bolts, after the aircraft (4) enters water, explosives of the explosion bolts are detonated, the shear lock is sheared off or the explosion bolts are broken along the bolt weakening grooves, and the load reducing rod is separated from the aircraft.
2. The underwater vehicle launching cavitation load shedding rod structure according to claim 1, characterized in that: the diameter and the length of the load reducing rod (1) enable the length of the generated cavitation bubble to be 1.2 times of the length of the aircraft (4), and the maximum diameter of the cavitation bubble is 1.5 times of the diameter of the aircraft (4).
3. The underwater vehicle launching water cavitation load shedding rod structure according to claim 1 or 2, characterized in that: the length of the cylindrical section of the load descending rod is 350mm, the diameter of the load descending rod is 100mm, the length of the truncated cone is 50mm, the thickness of the connecting body disc is 10mm, and the diameter of the truncated cone is 533mm, which is the same as the diameter of the head of the aircraft (4).
4. The underwater vehicle launching cavitation load shedding rod structure according to claim 1, characterized in that: the diameter of the disc of the positioning piece (2) is matched with the diameter of the head of the aircraft (4).
5. The underwater vehicle launching cavitation load shedding rod structure according to claim 1, characterized in that: the load reducing rod (1) is made of high-strength alloy steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010265651.9A CN111301604B (en) | 2020-04-07 | 2020-04-07 | Underwater cavitation load reduction rod structure for underwater vehicle throwing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010265651.9A CN111301604B (en) | 2020-04-07 | 2020-04-07 | Underwater cavitation load reduction rod structure for underwater vehicle throwing |
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| CN111301604A true CN111301604A (en) | 2020-06-19 |
| CN111301604B CN111301604B (en) | 2022-03-15 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111717331A (en) * | 2020-06-22 | 2020-09-29 | 哈尔滨工程大学 | Multistage load reduction device |
| CN114701599A (en) * | 2022-04-19 | 2022-07-05 | 吉林大学 | Buffer device for high-speed water entry of navigation body |
| CN115071880A (en) * | 2022-06-12 | 2022-09-20 | 西北工业大学 | High-speed underwater built-in energy-absorbing type combined load reduction structure and method for aircraft |
| CN115352571A (en) * | 2022-07-14 | 2022-11-18 | 哈尔滨工程大学 | Bionic load reduction structure capable of entering water for multiple times |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7123544B1 (en) * | 2004-05-24 | 2006-10-17 | The United States Of America As Represented By The Secretary Of The Navy | Assembly and method for determining speed of a supercavitating underwater vehicle |
| WO2013187674A1 (en) * | 2012-06-12 | 2013-12-19 | 한국과학기술연구원 | Supercavitating underwater vehicle |
| KR101353410B1 (en) * | 2013-06-21 | 2014-01-21 | 엘아이지넥스원 주식회사 | Underwater moving body |
| CN104590481A (en) * | 2014-12-11 | 2015-05-06 | 中国航天空气动力技术研究院 | Combined type cavitator |
| CN106364624A (en) * | 2016-10-27 | 2017-02-01 | 中国运载火箭技术研究院 | Control device and method applied to autonomous and stable navigation of navigation body |
| CN107310687A (en) * | 2017-06-21 | 2017-11-03 | 北京机械设备研究所 | A kind of resistance self-adapting changeable structure cavitation device |
| CN107719579A (en) * | 2017-09-28 | 2018-02-23 | 江苏大学 | A kind of design method of conical cavitation device |
| CN107738725A (en) * | 2017-09-28 | 2018-02-27 | 江苏大学 | A kind of supercavity submarine navigation device |
| CN108593255A (en) * | 2018-05-28 | 2018-09-28 | 西北工业大学 | A kind of ventilated supercavitation sail body rotation test device for water tunnel experiment |
| CN110143254A (en) * | 2019-05-15 | 2019-08-20 | 南京理工大学 | A kind of supercavity generating means |
-
2020
- 2020-04-07 CN CN202010265651.9A patent/CN111301604B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7123544B1 (en) * | 2004-05-24 | 2006-10-17 | The United States Of America As Represented By The Secretary Of The Navy | Assembly and method for determining speed of a supercavitating underwater vehicle |
| WO2013187674A1 (en) * | 2012-06-12 | 2013-12-19 | 한국과학기술연구원 | Supercavitating underwater vehicle |
| KR101353410B1 (en) * | 2013-06-21 | 2014-01-21 | 엘아이지넥스원 주식회사 | Underwater moving body |
| CN104590481A (en) * | 2014-12-11 | 2015-05-06 | 中国航天空气动力技术研究院 | Combined type cavitator |
| CN106364624A (en) * | 2016-10-27 | 2017-02-01 | 中国运载火箭技术研究院 | Control device and method applied to autonomous and stable navigation of navigation body |
| CN107310687A (en) * | 2017-06-21 | 2017-11-03 | 北京机械设备研究所 | A kind of resistance self-adapting changeable structure cavitation device |
| CN107719579A (en) * | 2017-09-28 | 2018-02-23 | 江苏大学 | A kind of design method of conical cavitation device |
| CN107738725A (en) * | 2017-09-28 | 2018-02-27 | 江苏大学 | A kind of supercavity submarine navigation device |
| CN108593255A (en) * | 2018-05-28 | 2018-09-28 | 西北工业大学 | A kind of ventilated supercavitation sail body rotation test device for water tunnel experiment |
| CN110143254A (en) * | 2019-05-15 | 2019-08-20 | 南京理工大学 | A kind of supercavity generating means |
Non-Patent Citations (3)
| Title |
|---|
| 王海斌等: "空泡形态与典型空化器参数关系的研究_小空泡数下的发展空泡形态", 《水动力学研究与进展》 * |
| 邓飞等: "头形对细长体超空泡生成与外形影响的实验研究", 《西北工业大学学报》 * |
| 齐江辉等: "空化器形状对超空泡流场影响的数值模拟", 《兵器装备工程学报》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111717331A (en) * | 2020-06-22 | 2020-09-29 | 哈尔滨工程大学 | Multistage load reduction device |
| CN111717331B (en) * | 2020-06-22 | 2022-02-01 | 哈尔滨工程大学 | Multistage load reduction device |
| CN114701599A (en) * | 2022-04-19 | 2022-07-05 | 吉林大学 | Buffer device for high-speed water entry of navigation body |
| CN114701599B (en) * | 2022-04-19 | 2023-02-28 | 吉林大学 | Buffer device for high-speed water entry of navigation body |
| CN115071880A (en) * | 2022-06-12 | 2022-09-20 | 西北工业大学 | High-speed underwater built-in energy-absorbing type combined load reduction structure and method for aircraft |
| CN115071880B (en) * | 2022-06-12 | 2023-11-17 | 西北工业大学 | Built-in energy-absorbing type combined load reduction structure and method for high-speed water entry of aircraft |
| CN115352571A (en) * | 2022-07-14 | 2022-11-18 | 哈尔滨工程大学 | Bionic load reduction structure capable of entering water for multiple times |
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| Publication number | Publication date |
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| CN111301604B (en) | 2022-03-15 |
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